A shell fired such that it hits a target at a distance 'b' and having height 'h' The minimum velocity with which it strikes the target

A shell fired such that it hits a target at a distance 'b' and having

1.	A shell fired such that it hits a target at a distance 'b' and having height 'h' The minimum velocity with which it strikes the target
Answer» `SQRT(2gh)` `sqrt(2G(b+h))` `sqrt(G(b+h))` `sqrt(g(b-h))` ANSWER :D